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Provide possibility to send generic JSON streams as chunked HTTP enti…
…ties (WIP). * Unified DittoDevOpsCommandActor with DevOpsCommandActor as there won't be further sub-classes. * Added custom serializer in order to send `JsonValue` throughout the Akka cluster. * Added custom message that wraps a SourceRef of JsonValues. * Added Akka Jackson serializer in order to serialize custom SourceRef-wrapping message. Signed-off-by: Juergen Fickel <juergen.fickel@bosch.io>
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...va/org/eclipse/ditto/services/gateway/endpoints/actors/JsonValueSourceToHttpResponse.java
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| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Copyright (c) 2021 Contributors to the Eclipse Foundation | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information regarding copyright ownership. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
| package org.eclipse.ditto.services.gateway.endpoints.actors; | ||
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| import java.util.function.Function; | ||
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| import javax.annotation.concurrent.Immutable; | ||
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| import org.eclipse.ditto.json.JsonValue; | ||
| import org.eclipse.ditto.model.base.common.ConditionChecker; | ||
| import org.eclipse.ditto.model.base.common.HttpStatus; | ||
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| import akka.NotUsed; | ||
| import akka.http.javadsl.model.ContentType; | ||
| import akka.http.javadsl.model.ContentTypes; | ||
| import akka.http.javadsl.model.HttpEntities; | ||
| import akka.http.javadsl.model.HttpEntity; | ||
| import akka.http.javadsl.model.HttpResponse; | ||
| import akka.stream.Attributes; | ||
| import akka.stream.javadsl.Flow; | ||
| import akka.stream.javadsl.Source; | ||
| import akka.util.ByteString; | ||
|
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| /** | ||
| * Transforms a {@link Source} of {@link JsonValue}s into a {@link HttpResponse}. | ||
| * The response's entity is a chunked stream of newline delimited JSON values (NDJSON). | ||
| * | ||
| * @see <a href="https://github.com/ndjson/ndjson-spec">NDJSON</a> | ||
| */ | ||
| @Immutable | ||
| final class JsonValueSourceToHttpResponse implements Function<Source<JsonValue, NotUsed>, HttpResponse> { | ||
|
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| /** | ||
| * The content type of the HttpResponse this function returns. | ||
| */ | ||
| static final ContentType CONTENT_TYPE_NDJSON = ContentTypes.parse("application/x-ndjson"); | ||
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| private JsonValueSourceToHttpResponse() { | ||
| super(); | ||
| } | ||
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| /** | ||
| * Returns an instance of {@code JsonValueSourceToHttpResponse}. | ||
| * | ||
| * @return the instance. | ||
| */ | ||
| static JsonValueSourceToHttpResponse getInstance() { | ||
| return new JsonValueSourceToHttpResponse(); | ||
| } | ||
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| @Override | ||
| public HttpResponse apply(final Source<JsonValue, NotUsed> source) { | ||
| ConditionChecker.checkNotNull(source, "source"); | ||
| return HttpResponse.create() | ||
| .withEntity(getChunkedHttpEntity(getRenderedCompactJsonArraySource(source))) | ||
| .withStatus(HttpStatus.OK.getCode()); | ||
| } | ||
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| private static Source<ByteString, NotUsed> getRenderedCompactJsonArraySource(final Source<JsonValue, NotUsed> source) { | ||
| return source.map(JsonValue::toString) | ||
| .via(intersperseWithNewlineDelimiter()) | ||
| .map(ByteString::fromString) | ||
| .withAttributes(Attributes.logLevels(Attributes.logLevelDebug(), Attributes.logLevelDebug(), | ||
| Attributes.logLevelError())) | ||
| .log(JsonValueSourceToHttpResponse.class.getSimpleName()); | ||
| } | ||
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| private static Flow<String, String, NotUsed> intersperseWithNewlineDelimiter() { | ||
| return Flow.of(String.class).intersperse("\n"); | ||
| } | ||
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| private static HttpEntity.Chunked getChunkedHttpEntity(final Source<ByteString, NotUsed> source) { | ||
| return HttpEntities.createChunked(CONTENT_TYPE_NDJSON, source); | ||
| } | ||
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|
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| } |
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